<template>
  <div id="home">
    <nav-bar class="home-nav">
      <div slot="center">购物街</div>
    </nav-bar>
    <tar-control :titles="['流行','新款','精选']"
                 @tabClick="tabClick"
                 ref="tabControl1"
                 class="tab-control" v-show="isTabFixed">

    </tar-control>
    <scroll class="content"
            ref="scroll"
            :probe-type="3"
            @scroll="contentScroll"
            :pull-up-load="true"
            @pullingUp="loadMore">
      <home-swiper @SwiperImageLoad="SwiperImageLoad" :banners="banners"/>
      <recommend-view :recommends="recommends"/>
      <feature-view/>
      <tar-control :titles="['流行','新款','精选']"
                   @tabClick="tabClick"
                   ref="tabControl2">

      </tar-control>
      <goods-list :goods="showGoods"/>
    </scroll>
    <back-top @click.native="backClick" v-show="isShowBackTop"/>
  </div>
</template>

<script>
  import {BACK_POSITION} from "common/const.js";
  import HomeSwiper from "./childComps/HomeSwiper";
  import RecommendView from "./childComps/RecommendView";
  import FeatureView from "./childComps/FeatureView";

  import TarControl from "components/content/tarControl/TarControl";
  import NavBar from "components/common/navbar/NavBar";
  import GoodsList from "components/content/goods/GoodsList";
  import Scroll from "components/common/scroll/Scroll";


  import {getHomeMultidata, getHomeGoods} from "network/home";
  import {itemListenerMixin,backTopMixin} from "common/mixin";
  import {NEW, POP, SELL} from "@/common/const";

  export default {
    name: "Home",
    components: {
      Scroll,
      GoodsList,
      HomeSwiper,
      RecommendView,
      FeatureView,
      NavBar,
      TarControl

    },
    data() {
      return {
        banners: [],
        recommends: [],
        goods: {
          'pop': {page: 0, list: []},
          'new': {page: 0, list: []},
          'sell': {page: 0, list: []}
        },
        currentType: 'pop',
        isShowBackTop: false,
        tabOffsetTop: 0,
        isTabFixed: false,
        saveY: 0,
      }
    },
    mixins: [itemListenerMixin,backTopMixin],
    destroyed() {
      console.log('home destroyed');
    },
    // 活跃路由调用
    activated() {
      // 设置当前所在位置
      this.$refs.scroll.scrollTo(0, this.saveY, 0)

      this.$refs.scroll.refresh()
    },
    // 离开时调用
    deactivated() {
      // 记录当前所在位置
      this.saveY = this.$refs.scroll.getScrollY()

      // 2.取消全局事件
      this.$bus.$off('itmImgLoad', this.itemImgListener)
    },
    created() {
      // 1.请求多个数据
      this.getHomeMultidata()
      // 2.请求商品数据
      this.getHomeGoods('pop')
      this.getHomeGoods('new')
      this.getHomeGoods('sell')


    },
    computed: {
      showGoods() {
        return this.goods[this.currentType].list
      }

    },
    methods: {
      /**
       事件监听相关的方法
       */
      tabClick(index) {
        switch (index) {
          case 0:
            this.currentType = POP
            break
          case 1:
            this.currentType = NEW
            break
          case 2:
            this.currentType = SELL
            break
        }
        this.$refs.tabControl1.currentIndex = index;
        this.$refs.tabControl2.currentIndex = index;
      },
      contentScroll(position) {

        this.isTabFixed = (-position.y) >= this.tabOffsetTop

        this.isShowBackTop = (-position.y) > BACK_POSITION
      },
      loadMore() {
        this.getHomeGoods(this.currentType)
        // 刷新一下
        this.$refs.scroll.scroll.refresh()
      },
      /**
       网络请求相关方法
       */
      getHomeMultidata() {
        getHomeMultidata().then(res => {
          this.banners = res.data.banner.list;
          this.recommends = res.data.recommend.list;
        }, err => {
          console.log(err);
        })
      },
      getHomeGoods(type) {
        const page = this.goods[type].page + 1
        getHomeGoods(type, page).then(res => {
          this.goods[type].list.push(...res.data.list)
          this.goods[type].page += 1
          this.$refs.scroll.finishPullUp()
        }, err => {
          console.log(err);
        })
      },
      SwiperImageLoad() {
        this.tabOffsetTop = this.$refs.tabControl2.$el.offsetTop
      }
    },
    mounted() {

    }
  }
</script>

<style scoped>
  #home {
    /*padding-top: 44px;*/
    position: relative;
    /*适口宽度*/
    height: 100vh;
  }

  .home-nav {
    background-color: var(--color-tint);
    color: ghostwhite;
    /*position: fixed;*/
    /*left: 0;*/
    /*right: 0;*/
    /*top: 0;*/
    /*z-index: 1002;*/
  }


  /*第一种方法可以父级不用pd-top*/
  /*.content{*/
  /*  height: calc(100% - 93px);*/

  /*  margin-top: 44px;*/
  /*}*/
  .content {
    position: absolute;
    overflow: hidden;
    top: 44px;
    bottom: 49px;
    left: 0;
    right: 0;
  }

  .tab-control {
    position: relative;
    z-index: 9;
  }
</style>
